Impact of EnVar hybrid assimilation using EnKF ensembles

V. S. Prasad; C. J. Johny; Jagdeep Singh Sodhi; E. N. Rajagopal

doi:10.1117/12.2222771

3 May 2016 Impact of EnVar hybrid assimilation using EnKF ensembles

V. S. Prasad, C. J. Johny, Jagdeep Singh Sodhi, E. N. Rajagopal

Author Affiliations +

Proceedings Volume 9882, Remote Sensing and Modeling of the Atmosphere, Oceans, and Interactions VI; 98820J (2016) https://doi.org/10.1117/12.2222771
Event: SPIE Asia-Pacific Remote Sensing, 2016, New Delhi, India

Abstract

Performance of an EnVar hybrid data assimilation system based on 3D Var NGFS (NCMRWF Global Forecast System) of T574 configuration and Ensemble Kalman Filter is investigated. The experiment is conducted during the Indian monsoon season (June-September) 2015 and compared against operational GSI 3D Var system. Two way coupled dual resolution hybrid system with 80 member ensemble of T254L64 configuration are used and forecasts are done for 10days. In hybrid experiment 75% weight is given to ensemble covariance and 25% for static covariance. The forecast skill of experiments over different spatial domains is compared against observations and respective analysis. The hybrid experiment produced significant improvement in forecasts compared to 3D Var in all fields except lower level temperature over tropical regions. Improvement is also seen in the prediction of extreme rainfall events. The prediction of monsoon onset and track of cyclone Ashobaa with hybrid and 3D var system is discussed.

Citation Download Citation

V. S. Prasad, V. S. Prasad, C. J. Johny, C. J. Johny, Jagdeep Singh Sodhi, Jagdeep Singh Sodhi, E. N. Rajagopal, E. N. Rajagopal, "Impact of EnVar hybrid assimilation using EnKF ensembles", Proc. SPIE 9882, Remote Sensing and Modeling of the Atmosphere, Oceans, and Interactions VI, 98820J (3 May 2016); doi: 10.1117/12.2222771; https://doi.org/10.1117/12.2222771

ACCESS THE FULL ARTICLE

PERSONAL SIGN IN
Full access may be available with your subscription

Email or Username Forgot your username?

Password Forgot your password?

Show

Remember Email/Username on this computer

Remember Password

No SPIE account? Create an account
or Institutional Sign In via Shibboleth

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $14.40

Non-members: $18.00 ADD TO CART

Show All Keywords

Keywords/Phrases

Search In:

Publication Years